The LINK-PP LS-SM551G-40I is an industrial-grade 1.25G SFP transceiver module engineered for high-performance optical networking. Operating over a 1550nm wavelength, it supports transmission distances up to 40km via duplex LC single-mode fiber. This robust optical transceiver complies with MSA and SFF-8472 standards, providing exceptional data integrity under demanding industrial environments ranging from -40°C to 85°C.
LINK-PP Part Number
LS-SM551G-40I
Vendor Name
LINK-PP
Form Factor
SFP
Max Data Rate
1.25Gbps
Wavelength
1550nm
Max Cable Distance
40km
Connector
Duplex LC
Media
SMF
Transmitter Type
DFB
Receiver Type
PIN
TX Power
-5 to 0dBm
RX Power
-23 to -1dBm
Receiver Sensitivity
-23dBm
DOM Support
Yes
Operating Temperature Range
-40 to 85°C
Protocols
SFF-8472 MSA Compliant, IEEE 802.3ah-2004
Key Features of LINK-PP LS-SM551G-40I 1.25G SFP
Key advantages include its rugged industrial temperature range, long-distance 40km reach, and dual LC single-mode interface. The built-in Digital Optical Monitoring allows precise parameter tracking, while its hot-pluggable design ensures low power consumption and seamless integration without network interruptions.
LINK-PP LS-SM551G-40I 1.25G SFP Optical Module
This 1.25G SFP optical module represents a reliable solution for enterprise and industrial networks. It integrates a 1550nm DFB laser and a high-sensitivity PIN receiver to deliver exceptional optical performance across single-mode fiber links.
LS-SM551G-40I: 1Gbps Connectivity for Data Centers
Delivering stable 1Gbps connectivity, this SFP transceiver effectively optimizes data center storage networks and enterprise architectures. It provides dependable fiber backhaul channels and high-density uplink configurations to ensure maximum network uptime and smooth data transmission.
LS-SM551G-40I Module with 1550nm Wavelength
Utilizing the specialized 1550nm wavelength, this optical transceiver achieves significantly low signal attenuation over long distances. The DFB laser source guarantees stable spectrum performance, making it perfect for long-haul single-mode fiber telecommunication architectures.
LS-SM551G-40I Module Supporting 40km Transmission
Engineered for extended reach, this transceiver effortlessly supports up to 40km single-mode fiber transmissions. It eliminates the need for extra optical repeaters, significantly reducing infrastructure costs while maintaining superior signal integrity over long-distance links.
LS-SM551G-40I Module with Duplex LC Interface
Featuring a standardized duplex LC connector, the module ensures secure, stable, and high-density fiber cable connections. Its precise mechanical alignment minimizes insertion loss and return reflections, optimizing structural layout efficiency in distribution frames.
LS-SM551G-40I Module with DOM for Real-Time Monitoring
Equipped with Digital Optical Monitoring via the SFF-8472 interface, the transceiver provides comprehensive real-time tracking. Network administrators can easily monitor operating voltage, temperature, laser bias current, and transceiver power to prevent unexpected downtime.
LINK-PP LS-SM551G-40I 1.25G SFP Certification
The LS-SM551G-40I complies with comprehensive global standards, ensuring safety and operational excellence. Each transceiver undergoes standardized compliance validation to guarantee robust long-term reliability in networks.
LINK-PP implements a rigorous, multi-stage quality assurance protocol. Every individual unit undergoes comprehensive automated parameter checking to ensure perfect compliance with mechanical and optical performance standards.
LS-SM551G-40I Quality Certifications
This industrial-grade optical module holds prestigious regulatory certifications, including CE, FCC, and RoHS compliance. These international standards guarantee environmental eco-friendliness, electrical safety, and superior industrial performance.
This product is in conformity with ISO9001. This system is valid to a company engaging in development, production and supply service of fiber optical products. Please contact us to learn more.
ISO/IEC 27001 is an international standard for managing and processing information security. This standard is jointly developed by the International Organization for Standardization (ISO) and the International Electrotechnical Commission (IEC). It sets out requirements for establishing, implementing, maintaining, and continually improving an information security management system (ISMS). Ensuring the confidentiality, integrity, and availability of organizational information assets, obtaining an ISO 27001 certificate means that the enterprise has passed the audit conducted by a certification body, proving that its information security management system has met the requirements of the international standard. Please contact us to learn more.
This product is in conformity with ISO14001.It is intended for use by an organization seeking to manage its environmental responsibilities in a systematic manner that contributes to the environmental pillar of sustainability. Please contact us to learn more.
ISO 45001 is a global standard that sets out the requirements for an occupational health and safety management system (OH&SMS).
REACH is a European Union regulation concerning the Registration, Evaluation, Authorization and Restriction of Chemicals. It came into force on 1st June 2007 and replaced a number of European Directives and Regulations with a single system. The regulation aims to protect human health and environmental safety, maintain and improve the competitiveness of the EU chemical industry, and develop innovative capabilities for non-toxic and harmless compounds to prevent market fragmentation, increase the transparency of the use of chemicals, promote non-animal experiments, and pursue sustainable social development.Please contact us to learn more.
This product meets the applicable requirements of Directive (EU) 2015/863 of RoHS. It restricts the use of 10 hazardous materials in the manufacture of various types of electronic and electrical equipment: lead, mercury, cadmium, hexavalent chromium, polybrominated biphenyls, polybrominated diphenyl ethers, and four different phthalates. Please contact us to learn more.
This product fully accords with the FCC, which aims to manage the radio wave and magnetic fields more reasonably. Please contact us to learn more.
CB is an international system operated by IECEE. This product is based on IEC standards for testing the safety performance of electrical products. Please contact us to learn more.
This product fully accords with UKCA (UK Conformity Assessed) certificate, which signifies that it meets all relevant quality standards as well as health and safety requirements. Please contact us to learn more.
UL certification is a non-mandatory certification in the United States,mainly testing and certification of product safety performance.Its ultimate purpose is to obtain products with a fairly safe level for the market,and to contribute to ensuring human health and property safety.Please contact us to learn more.
LS-SM551G-40I Certified for Reliable Host-Device Compatibility
Certified through extensive compatibility matrix verifications, the transceiver guarantees complete interoperability. It operates flawlessly across diverse networks, preventing hardware rejection and communication mismatches.
Rigorous Testing Ensures Reliable SFP Performance
LINK-PP applies comprehensive validation methods to guarantee that every optical transceiver maintains consistent throughput and enterprise-level reliability under heavy traffic loads.
Optical Spectrum Test
Verifies that the 1550nm center wavelength remains precise and stable across extreme industrial temperatures.
Eye Pattern Test
Measures transmitter signal quality, ensuring clear optical eye margins and zero waveform distortion.
Bit Error Rate Test
Validates flawless data packet transmission, ensuring maximum signal integrity under full 40km stress.
Temperature Test
Subjects the module to -40°C to 85°C cycles to verify structural and electronic stability.
Product Shipping for LINK-PP LS-SM551G-40I 1.25G SFP
Our streamlined global supply chain ensures secure packaging and rapid delivery, safeguarding your hardware investments from dispatch to final onsite installation.
Anti-Static Protective Packaging
Individual ESD bags eliminate electrostatic discharge risks during handling and storage.
This operational demonstration highlights the seamless installation of the SFP module into an active industrial switch. The system automatically identifies the transceiver, establishes a 40km connection instantly, and displays real-time DDM diagnostic telemetry.
LS-SM551G-40I Technical Support
LINK-PP provides professional technical support, including pre-sales consultation, compatibility verification, and post-deployment troubleshooting to ensure smooth network operation.
Pre-Sales Technical Consultation
Professional technical guidance to help customers select the most suitable LS-SM551G-40I modules based on network architecture and application requirements.
Compatibility Verification Support
Compatibility checks and validation to ensure seamless operation with Cisco switches and other supported networking platforms.
Deployment & Installation Assistance
Step-by-step support for installation, configuration, and initial deployment to ensure stable and correct operation.
Long-Term Technical Assurance
Ongoing technical support throughout the product lifecycle to ensure reliable performance in enterprise and carrier-grade networks.
A:
For sure! We offer tiered B2B discounts. For 200 pieces, the unit price drops nicely. Just ping our sales team and we’ll sort out a custom quote for your procurement. By
admin on
2026-05-07
A:
Yes, they feature built-in DOM/DDM following the SFF-8472 standard. Your NOC team can easily monitor temperature, voltage, laser bias, and TX/RX optical power in real time. By
admin on
2026-01-12
A:
You'll need Single Mode Fiber (SMF) patch cables with a Duplex LC connector. This module is optimized specifically for that setup to hit the full 40km reach using a 1550nm wavelength. By
admin on
2025-09-18
A:
Yes! This module is fully MSA compliant, so it plays nice with Cisco, Ubiquiti, MikroTik, and other major brands without triggering any OEM lock-out errors. By
admin on
2025-05-06
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491457
243167
I***o
Spain
Verified
Purchase
5 .0
2025-05-16
Worked great and reduced bottleneck. Haven't had any issues whatsoever with these Optical Transceiver Module. Good material quality and feel. So I bought the second one as a spare.
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491457
243159
J***k
South Africa
Verified
Purchase
5 .0
2025-05-16
Replaced dying optics with this MSA compliant 1G SFP. Works instantly across multiple brands without OEM lockouts. Built-in DOM tracks laser bias accurately during our heavy loads.
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491457
277654
A***r
Poland
Verified
Purchase
5 .0
2025-01-26
Tested the duplex LC SMF module on a 35km campus fiber run. The 1550nm DFB laser pushes great signal, RX sensitivity is well within -23dBm specs. Recommend for ISPs!
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491457
243172
E***z
Peru
Verified
Purchase
5 .0
2024-11-15
Setting up a remote base station backhaul. The industrial temperature -40 to 85°C rating is a lifesaver. Link came right up at 1.25Gbps over single mode fiber.
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491457
243169
R***n
Mexico
Verified
Purchase
5 .0
2024-03-24
Placed the order easily, Fast shipping. Thanks Yoeng, keep me posted the order status till to my desk, good job. So far all good – I have heard nothing from my lab which is a good sign!
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491457
243164
A***n
Japan
Verified
Purchase
5 .0
2024-03-02
It was really easy to navigate and place the order.I have ordered for years from them and always have a great experience, time after time! I will continue ordering for the rest of our lives!!!
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